Respuesta :

Answer:

Step-by-step explanation:

a + 2b = 4

3a + 6b = 12

3a + b = 7

5b = 5

b = 1

a = 2 because

2(1) + a = 4

Answer:

  • a = 2
  • b = 1

Step-by-step explanation:

We know that:

  • a + 2b = 4
  • 3a + b = 7

Work:

  • a + 2b = 4

        3a + b = 7

  • 3(a + 2b = 4)

        3a + b = 7

  • 3(a + 2b = 4)
  • 3a + b = 7
  • 3a + 6b = 12
  • 3a + b = 7
  • 3a + 6b = 12
  • -3a - b = -7
  • 5b = 5
  • b = 1

Now, let's substitute the value of b into the first equation.

  • a + 2b = 4
  • => a + 2(1) = 4
  • => a + 2 = 4
  • => a = 2

Hence, the missing values are:

  • a = 2
  • b = 1